Cutting attachment for looms



R. MARX CUTTING ATTACHMENT FOR LOOMS June 3 Filed April 19, 1920 2 Sheets-Sheet l u \ll l.

June 3 L924. 1,496,241

R. MARX CUTTINGATTACHMENT FOR LOOMS mp6 if Patented June 3, 19240 UNITED srivrizs RICHARD MARX, OF PHILADEIQPHIA, PENNSYLVANIA.

CUTTING ATTACHMENT FOR LOOMS.

Application filed April 19, 1920.

Another object of the invention is to provide a thread cutting device having rela-..

tively narrow lateral dimensions adapted for use with other similar devices in a series as an attachment for a loom, for the purpose of forming a pile by cutting the weft threads of the fabric; the inventioniincluding a form of shear blade especially adapted to enter between the threads of the chain formed by the weft at a point between adjacent warp threads.

I further desire to provide a shear of the general type above noted in which the coacting elements shall be so constructed and mounted that their cutting edges under working conditions shall have a point engagement and clear each other at all other points. 7

I also desire to provide a novel mounting for a series of weft thread cutters together with novel means for actuating the movable elements of such cutters whereby these shall all be simultaneously actuated to the desired extent.

These objects and other advantageous ends I attain as hereinafter set forth, reference being had to the accompanying drawings, in which,-

Fig. 1 is a side elevation of one of the cutting, devices constituting my invention:

Figs. 2 and 3 are respectively a plan and a front elevation of the device shown in Fig. 1;

Figs. 4 and 5 are respectively a side elevation and a plan of the blank from which one of the elements of mycutter is formed;

Figs. 6 and 7 are respectively a side elevation and a plan showing the blank of Fig. 4 in its partially formed condition;

Figs. 8 and?) are; respectively a side and an end elevation, both partly in section,

Serial No. 375,011.

illustrating the actuating mechanism for a series of the cutting devices.

In the above drawings 1 and 2 represent the two coacting elements of my cutter more or less loosely connected by a pivot in the form of a rivet 3. The first of these elements consist of a fiat piece of sheet steel having a cutting edge 4 which in the present instance is substantially straight and is ground so that it lies at an angle somewhat less than 90 deg. to the plane. of said element 1. The upper end of this movable cutting element is extended to form a head 5 for engagement with an operating device as hereafter described.

The relatively stationary element 2 of my cutter is likewise for the most part formed of a flat piece of hardened sheet steel having a hooked portion 6 provided with a reinforcing or spacing plate 6 riveted or otherwise rigidly attached to it and designed for engagement with a supporting structure as hereafter noted. Said element likewise has a cutting edge 7 ground at an angle of less than 90 deg. to its plane and in position to coact with the cutting edge 4.- of the element 1. The element 2 is extended beyond its cutting edge 7 to form a relatively flat laterally extended tongue 8, in the end of which is a perforation 9 for the reception of a guide wire 10 which passes through one of the heddles of the 100111 to which the cutter is attached.

This tongue (Fig. 4) as originally formed lies in the plane of the body of the element 2 as shown at 8. Figs. 4 and 5 and is thereafter twisted through an angle of 90 deg. so that. as shown in Figs. 6 and 7 at 8 it lies in a plane substantially at right angles to the plane of the body of the element. Thereafter the portion of the latter'having the cutting edge 7 and including the tongue is bent laterally in a line at an acute angle to the plane of thebody toward the side thereof to which the movable cutting element 1 is fixed. as shown in Fig. 2 so that the center of the perforation 9 in'the tongue lies in a vertical plane including the greater portion of the cutting edge 7 and that face of the element 2 against which the element 1 is pivoted.

.As previously noted, the pivotal connection between the element s l and 2 is more or less loose so as to permit of the elemejnt 1 being? maintained in a plane slightly in;-

clined to that of the element 2 in order to cause'a'point engagement of'the two cutting edgeset' and 7. F or this purpose the element 2 is formed with two protuberances 12 and 18 projecting toward the adjacent face of the element 1 so as to engage the same on that side of the pivot 3 opposite the points of engagement of the cutting edges. The projection 12 is preferably formed merely by indenting one side of the body of the element 2 so as to cause it to form a round headed projection on the opposite side or face and the protuberance 13 is formed in tlie end of a tongue 14: cut out of the bodyof said element and having a permanent set so that it with the protuberance 12 and the loose pivot 3 causes the angularity or inclination of the movable element 1 necessary to maintain the two cutting edges a point engagement throughout their entire range of movement.

' For supporting aseries of cutting elements such as those above. described, a beam 15 is mounted transversely of the loom and I on the outer portions of this are two bearing structures 16 andd'Z in which is mounted an oscillatory bar 18. Extending imme diately above but spaced away from the top surface of the bea n15 is a cutter-supporting bar 19 having. in its forward edge a longitudinally extending groove of inverted L section shaped to receive the hooked ends 6 of a' series of cutters of the construction above described. These are held in place a cap or cover plate 20 removably bolted to the top faceof the holder bar 19 so that all of said cutters project forwardly from it in substantially parallel vertical planes with the tongue portions 8 of their elements 2resting upon or immediately adjacent the fiat top face of the beam 15 For ste adying and supporting the oscillatory barlS at points betweenits bearings I provide it with a journal portion 21 concentric with its axis of oscillation and mount on the bar 19 an auxiliary bearing 22 having a' portion fitting said journal. The bar 18' has a lo ngitudinally extending groove or slot in its under face into which extend all of the heads 5 of tli movable cutter elenie ts 1 stunt as bar is axially turned these elements are operated on their respective pivots to cause" their cutting edges to c'oact with the cuttingredges Tot the fixed elements 2 Foraetuating the oscillatory bar 18 one ofits ends is extended beyond its bearing 16 and has keyed or otherwise fixed to it a i arm 23, which through a pin 24; is connected to the short arrnbt a lever 25 fulcrumed at 26 to a or other suitable supporting structure mounted on the beam1'5'. The long arm of this lever has a laterally projecting pin 28 extending. through 'a'slot 29 formed in the standard 27 concentric with the fulcrum pin 26 and this pin in turn engages an arm 30 :tulcrumed to the top of the standard 27' at 31. The lower end of said arm through alongitudinally adjustable link 32 is connected to the lay or other suitably timed movable member of the loom.

Under conditions of operation each beat of the 'lay through the link 32 arms 30 25 and 23, causes an angular movement in its bearings of the cutter actuating bar'1'8, and thereby causes all of the elements 1 of the cutters to be simultaneously operated. By means forming no part of the present .invention the successive chains of wett lthreads Of the newly woven fabric are guided onto the tongues 8 oi the fixed cutting elements 2, which asbefore notedj extend between the warp threads at any desired intervals. Each time therefore that the fabric is moved rearwardly one or more sets of weft threads are moved over each tongue 8 onto the fixed cutting edge '7 and are immediately thereafter cut by the operation of the movable cutter elements 1. i

Owing to the peculiar mounting and construction of said cutting elements the'threads are cleanly and invariably cut and "it isobvious that these elements are maintained in operative. condition with but little likelihood of getting out of order,'by reason of the arrangement and construction of parts illus trated. The spring tongue 14 on which is mounted the projection 13, acts to yieldingly hold the two cutting edges 4 and 7 in their operative positions and if for any reason it should be desired to replace one 01 1110116 of the cutters, this may be conveniently done by taking off the cap plate 20 from the cutter supporting bar 19 and removing the hooked end 6 of each of the cutters desired from its recess in said bar. Either of the-cutting edges may be conveniently ground when it becomes dull and by reason of the peculiar formation of the tongue 8 it is obvious that the length or: the pile on opposite sides of each of'the cutters is necessarily equal.

I claim: e

1. A, shear for use on a pile fabric loom consisting of two blades having coacting cutting edges and loosely pivoted together so as to belaterally inovable; with two projections on one of the blades engag ng the other blade to incline it to the plane of the first blade and to cause a point engagement of the cutting edges. 2. A cutter for use on a pile fabric loom and. consisting of two flat blades having coaeting cutting edges; a pivot loosely connecting said blades and yielding means ntegral with one of the blades for maintainmg it at an angle to the plane of the other with the cutting edges in point engagement.

8. A cutter consisting of a relatively fixed member having a straight bottom edge and including a cutting edge, with a tongue projecting therefrom, said member also having a rearward projection formed to fit a holder; a relatively movable member loosely pivoted to said first member and having a cutting edge cooperating with the cutting edge of the latter; with two projections on one of the members engaging the other member to maintain the cutting edges in a point engagement.

4;. The combination in a cutter for a pile fabric loom of two blades having coacting cutting edges; a pivot loosely connecting the blades to permit of their relative lateral movement and a plurality of projections on one of the blades engaging the other blade on the side of the pivot distant from the cutting edges for maintaining the latter in the point engagement.

5. The combination in a cutter of two blades having coacting cutting edges; a pivot loosely connecting said blades; and a spring tongue out out of one of said blades and yieldingly engaging the other to maintain the cutting edges in the point engagement.

6. The combination in a cutter for a pile fabric loom comprising two blades having coacting cutting edges; a pivot loosely connecting said blades; a spring tongue out out of one of said blades andtwo projections of which one is on said tongue whereby one of the blades is maintained at an angle to the other with the cutting edges in a point engagement.

7. The combination in a cutting attachment for a loom of a supporting beam; a cutter bar spaced away from the same and having a longitudinally extending groove; a series of cutters each consisting of two coacting blades of which one blade of each cutter has a portion extending into said groove and the other blade has a projecting portion; a cap plate on said bar removably holding the cutters in place in the groove; and an oscillatory member engaging the projections of the other blades of the series to cause the cutting edges of each pair of blades to cooperate to shear the weft threads of the fabric.

8. The combination in a cutting attachment for a loom of a supporting beam; a cutter bar spaced away from the same having a longitudinally extending groove; a series of cutters each consisting of two coacting blades of which one blade of each cutter has a portion extending into said groove and the other blade has a projecting portion; a cap plate on said bar removably holding the cutters in place in the groove; and an oscillatory member engaging the projections of the other blades of the series to cause the cutting edges of each pair of blades to cooperate to shear the weft threads of the fabric, each of said cutters having a projecting tongue for guiding the weft threads of a fabric to its cutting edge.

RI CHABD MARX. 

